Blender is open-source 3D software. While it is not real-time previs like Cine Tracer, there are hundreds of free add-ons for "Camera Crane" and "Depth of Field" simulation. Download the free "Blender Studio" clips to learn cinematography.
If you need a dedicated tool to quickly block out light and camera positions, Cine Tracer is a unique and specialized option. However, if you are comfortable with a steeper learning curve, many professionals on suggest using Unreal Engine